New Sparse Attention Nodes for H3 Model Boost Speed by 30%
Zironic · reddit · 2026-08-21
A developer released optimization nodes for the H3 model in ComfyUI, featuring Sparse Attention and Memory Optimization. Sparse Attention allows retaining only 10%-30% of attention, utilizing Sparse Sage (INT8/FP8 quantization) to drastically reduce compute. The Memory Optimization node manages QKV and MLP activations via chunking, solving VRAM bottlenecks and speeding up QKV processing by 10%-30%.
Related event: New ComfyUI Sparse Attention Nodes Speed Up H3 Video Generation(2 posts)→
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